20 



ME. G. W. LAMPLUGH ON THE JUNCTIOIN' OF [vol. IxX^iii, 



s.s.w. 



Fig. 11. — JSfortliern part of the section on tlie luest side of Mile- 

 tree Farm Pit, Shenley ; Sejytemher 10th Sf ISth, 1920 

 supplemented hy previous observations, April 1014. 

 Surface at the northern end, ahout 350 feet O.D., 

 falling slightly southwards. 



N.N.E. 



ertical Seal? Horizontal reduced i 



Z, Soil and wash 



ZY 

 4 



3 a 



2. 



y 



J 



1 to3 



0to3 



0to5 



Til icTcn ess in feet. 

 at the northern end, clajej^ with a few stones,"^ 

 ZY 

 passing down imperceptibly into -j^; at the southern end, more I 



sandy, thicker, and containing some fragments from the iron- j 

 stone-breccia. J 



Disturbed and rearranged claj^ with an occasional flint or drift- "^ 

 pebble,^ mostly ' trail ' or Gault-creep ; massive and slickened ; in ( 

 places, passing down into 4 : in others, separated from 4 bj' a ^ 

 sharp slicken-plane. ) 



4. Dark greyish-blue Gault, disturbed at the top; darker, and with"^ 

 definite bedding below : weathered and full of ' race ' in places : j 

 ' Belemnites minimus,' no other identifiable fossils seen. J> 



4a. Clay with small grit-grains, and a crimson streak in places; 2 to | 

 3 inches thick. J 



(The Gault thickened eastwards, in a portion of the pit now 

 obscured.) 



3. Iron-grit breccia, ochreous, lump}- and irregular, streaked and^ 

 mixed with gritty greensand-loam ; soft pale calcareous con- 

 cretionarj'' patches with occasional traces of fossils ; undu- 

 lating and crinkled tabular 'iron-pan' at the top in places, an 

 inch or so thick, sometimes also ruiming among or under 

 breccia, wath smooth-worn surface under the Gault : sporadic 

 pale gritty phosphatic nodules among the greensand-loam. 

 ' Janira quinquecostata ' was the only identifiable fossil obtained 

 (in greensand). 

 Mottled loamj'^ calcareous greensand-grit with small pebbles (up^ 

 to 1 inch in diameter) and occasional gritty phosphatic nodules, > 

 in hollows of the uneven eroded floor of (2). ) 



The Silty beds : well stratified silts and loamy sands : maximum 

 thickness now visible as below ; but all have disappeared 45 yards 

 farther southwards, and the section is then as in Nine Acre pit. 



#to2 



Oto 



1 In 1914 I found a 6 -inch boulder of pink granite among the stones from 

 the top of the section, a point worth mentioning on account of the rarity of 

 igneous rocks in the drift of the district. 



